CN101453282A - Time clock distribution method, equipment and system - Google Patents
Time clock distribution method, equipment and system Download PDFInfo
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- CN101453282A CN101453282A CNA200710077477XA CN200710077477A CN101453282A CN 101453282 A CN101453282 A CN 101453282A CN A200710077477X A CNA200710077477X A CN A200710077477XA CN 200710077477 A CN200710077477 A CN 200710077477A CN 101453282 A CN101453282 A CN 101453282A
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Abstract
The embodiment of the invention discloses a method, a system and corresponding network node equipment for clock distribution. Clock information is borne in a multicast message; network nodes automatically join in a multicast group; the multicast message is distributed to all the network nodes in the multicast group in a multicast mode; the network nodes extract the clock information; and the multicast message is sent to the network nodes through a main multicast source or a standby multicast source, and the network nodes can switch the multicast sources. Correspondingly, the embodiment of the invention discloses the network node equipment and a network system for the clock distribution. The clock distribution through the multicast mode saves network resources. By switching the main multicast source and the standby multicast source, the automatic backup of a clock source is realized, and the reliability of the clock distribution is improved.
Description
Technical field
The present invention relates to the communication technology, specifically, relate to a kind of method, equipment and system of clock distribution.
Background technology
Network broadbandization can communicate people swimmingly on broad information superhighway, traditional point to point link progressively develops into multi-point.
LMCS can be used traditional unicast technique and realize, as network TV business, shown in Fig. 1 left part, video server sends to 30 final recipients with video flowing via router, realize by following three steps: at first, by unicast routing protocol, router is grasped network topological information, forms unicast routing table; Once more, video server duplicates 30 parts with video message and is sent to router; At last, router is forwarded to final recipient according to unicast routing table with these messages.
Along with the increase of final receiving terminal quantity, the load of the video server and the network equipment all can suddenly increase.The path that video flowing is flowed through in network forms a tree structure, and each branch of this tree all has the identical video flowing of a plurality of contents simultaneously, causes the bandwidth serious waste.Can optimize this communication mode, as shown in Figure 1, in fact, as long as transmit a video flowing in each branch of this tree, duplicate at the crotch of setting, video flowing can be sent to all recipients, we claim that this tree is a distribution tree.Multicasting technology just is being based on this thinking structure.Shown in the right part of Fig. 1, multicast routing protocol at first forms distribution tree, transmits a video flowing by each branch at distribution tree, and after the crotch of tree duplicated, video flowing was ultimately delivered to all recipients from server.
Present broadband clock distribution approach is to adopt the IP unicast distribution technology, as shown in Figure 2.
A BSC (Base Station Controller, base station controller) manages many BS (BaseStation down, the base station), in order to distribute the ClockA clock by IP network, need to create the clock ClockA that 2 Business Streams (using 2 service ports) carry BSC in IP network, BS1 and BS2 can correctly recover the clock ClockA of BSC like this.
In IP network, adopt unicast technique distribution clock, have following deficiency:
(1) waste Internet resources: what BS are arranged, just need to create how many bar Business Streams, promptly need to use what service ports, and the clock information of every Business Stream carrying is the same.This with regard to significant wastage Internet resources (comprising network traffics and service port resource);
(2) clock distribution complex management: BS of every increase, all need Business Stream of manual configuration corresponding with it, in case BS quantity explodes, the increase of clock distribution management complexity is difficult to control.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides a kind of method, system and corresponding network node equipment of clock distribution, to improve the deficiency of clock distribution approach of the prior art, realize clock source automated back-up for a long time simultaneously, to improve the reliability of clock distribution.
The embodiment of the invention provides a kind of time clock distribution method, comprising: clock information is carried in the multicast message; Described multicast message is distributed to network node in the multicast group via main multicast source in the multicast mode; Described network node receives described multicast message, converts described multicast message to unicast message, extracts described clock information.
The embodiment of the invention provides a kind of apparatus for network node, comprising: the message receiver module is used to receive the multicast message through the carrying clock information of main multicast source distribution; The message modular converter is used for the described multicast message that described message receiver module receives is converted to unicast message; The clock information extraction module is used for extracting described clock information from described unicast message.Described apparatus for network node further comprises active and standby multicast source handover module, and whether be used to detect multicast service normal, if service disconnection is carried out active and standby multicast source and switched.
The embodiment of the invention also provides a kind of network system, comprising: clock dispensing apparatus, a plurality of network node.Wherein, the clock dispensing apparatus multicast message that is used for will carrying with multicast mode the clock source is provided to described a plurality of multicast node; Described a plurality of network node is used to receive the multicast message in described carrying clock source and be converted to corresponding unicast message, extracts clock information from described unicast message.Described clock dispensing apparatus comprises main with multicast source and standby multicast source.Whether described a plurality of network node detects multicast service normal, if service disconnection is led with multicast source or standby multicast source and switched.
The embodiment of the invention is distributed clock by the multicast mode, has saved Internet resources.Realize automated back-up clock source by switching active and standby multicast source, improved the reliability of clock distribution.Business Stream is created and is realized semi-automation, and the user only needs that client is added multicast group and gets final product, and need not to create complicated corresponding one by one Business Stream, has made things convenient for network operation.
Description of drawings
Fig. 1 is a prior art multi-point exemplary plot;
Fig. 2 is a technical scheme schematic diagram of distributing clock in the prior art IP network by clean culture;
Fig. 3 distributes the technical scheme figure of clock by the multicast mode for the embodiment of the invention;
Fig. 4 adds the schematic diagram of multicast group for embodiment of the invention network node;
Fig. 5 replaces to the multicast forwarding message for the embodiment of the invention apparatus for network node schematic diagram of unicast message;
Fig. 6 is an embodiment of the invention network node structure schematic diagram;
Fig. 7 switches the schematic diagram that multicast source is realized the clock Source backups for the embodiment of the invention;
Fig. 8 is the practical application scene schematic diagram of the embodiment of the invention at 3G.
Embodiment
The embodiment of the invention provides a kind of method, apparatus for network node and system of clock distribution.Realize the clock distribution with multicast mode, realize the clock Source backups simultaneously.
In IP network, by the packet network clock technology certain clock information (ClockS) is carried in the multicast message, and pass through multicasting technology, with the message multicast distribution of carrying ClockS clock all receiving equipments in the particular multicast group, on receiving equipment, use the packet network clock technology to extract the clock information that is carried in the multicast message.
Referring to Fig. 3, at server end, clock information ClockS is carried in the multicast message by the packet network clock technology, considers the problem of clock backup, adopts two multicast sources, and a usefulness is decided and used multicast source, and another is as standby multicast source.Under the normal condition, message is distributed to multicast group in each client network node with multicast source in the multicast mode through main.In case the client network node is found the master and breaks down with multicast source that as service disconnection, then automatically switch to standby multicast source, clock information ClockS changes by being distributed to each client network node in the multicast group through standby multicast source in the multicast mode.Equally, can realize that standby multicast source is to main switching with multicast source.
Increase the clock information of a client network node reception server end if desired, only need on the client network node device, dispose multicast service, this network node is joined in the multicast group automatically by the IGMP agreement.The client network node sends the IGMP request message to multicast source, after multicast source is received request message, sends the IGMP response message to the client network node, and the client network node adds multicast group to be finished.Referring to Fig. 4.
Adopt multicasting technology scheme distribution clock, Business Stream is created and can be realized semi-automation, and the user only need add this multicast group with client and get final product at the client configuration multicast service, need not to create complicated Business Stream one to one.In case the client network node very for a long time, the embodiment of the invention has greatly made things convenient for network operation.
In view of existing packet network clock technology is a kind of point-to-point technology, this programme adopts the technology of " multicast replaces to clean culture ", and the multicast message that will carry clock information ClockS on the client network node replaces to the unicast message that the client network node can be discerned.Referring to Fig. 5, the client network node is selected the IGMP business and is E-Packeted from the message that receives, judge that again the customizing messages whether the IGMP business E-Packets with the packet network message is complementary, if coupling then information such as the MAC Address of multicast message, IP are replaced to the information such as MAC Address, IP of unicast message, and then adopt the packet network clock technology, the clock information that is carried in the message is extracted.
Referring to Fig. 6, the client network node comprises message receiver module, message modular converter, clock information extraction module in the embodiment of the invention.Wherein:
The message receiver module is used to receive the multicast message through the carrying clock information of main multicast source distribution;
The message modular converter is used for the described multicast message that described message receiver module receives is converted to unicast message;
The clock information extraction module is used for extracting described clock information from described unicast message.
The client network node may further include active and standby multicast source handover module, and whether be used to detect multicast service normal and carry out active and standby multicast source and switch.Referring to Fig. 7, the client network node device has been configured active and standby multicast source, and whether active and standby multicast source handover module detects multicast service normal, if service disconnection then changes the message recovered clock by standby multicast group automatically into.
Correspondingly, a kind of network system is distributed clock in the multicast mode, comprises clock dispensing apparatus, a plurality of network node, wherein:
The clock dispensing apparatus, the multicast message that is used for will carrying with multicast mode clock information is provided to described a plurality of network nodes;
A plurality of network nodes are used to receive the multicast message of described carrying clock information and are converted to corresponding unicast message, extract clock information from described unicast message.
A plurality of network nodes are a plurality of client network node recited above, and the multicast message of carrying clock information is issued to each network node with the multicast form.Multicast source comprises main with multicast source and standby multicast source, and the multicast message of carrying clock information is issued to network node through main with multicast source or standby multicast source.Concrete distribution procedure and handoff procedure are seen top introduction.
The example application of the embodiment of the invention in 3G is described below.
In actual 3G used, base station (BS) need be by the clock information of IP network reception from BSC for the clock of synchronising base station controller (BSC).Referring to Fig. 8.
BSC adopts the packet network clock technology that clock information ClockS is carried on and E-Packets, described message is distributed to following BS with multicast mode, selecting the IGMP business from the message that receives E-Packets, judge that again the customizing messages whether the IGMP business E-Packets with the packet network message is complementary, if coupling then information such as the MAC Address of multicast message, IP are replaced to corresponding unicast message information, and then adopt the packet network clock technology, the clock information that is carried in the message is extracted.
BSC has disposed active and standby multicast source, and whether BS detects multicast service normal, if service disconnection is then switched another multicast source, by another multicast source distribution message, and from corresponding message recovered clock.
Increase a BS if desired, only need on BS to be increased, dispose multicast service, this BS is joined in the multicast group automatically by the IGMP agreement.BS sends the IGMP request message to multicast source, after multicast source is received request message, sends the IGMP response message to BS, and BS adds multicast group.
Adopt the embodiment of the invention, then the base station controller device just will take a network port, by the technology of multicast distribution clock, clock source information can be distributed to N corresponding base station, has significantly reduced network equipment resource and network traffics resource; Simultaneously, adopt this technology can set up network tree automatically, finish the business configuration function automatically.And use the multicast source fault in case run into the master, and can also automatically switch on the standby multicast source, realize seamless clock source handoff functionality, increase the fail safe of system.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of time clock distribution method is characterized in that, comprising:
Clock information is carried in the multicast message;
Described multicast message is distributed to network node in the multicast group via main multicast source in the multicast mode;
Described network node receives described multicast message, converts described multicast message to unicast message, extracts described clock information.
2, time clock distribution method according to claim 1, it is characterized in that, further comprise, whether described network node detects multicast service normal, if service disconnection, then switch to standby multicast source, described multicast message is distributed to described network node in the multicast group by standby multicast source in the multicast mode.
3, time clock distribution method according to claim 1 is characterized in that, disposes multicast service on the network node of described multicast group to be added, joins in the described multicast group by the network node of IGMP agreement with described described multicast group to be added.
4, time clock distribution method according to claim 1, it is characterized in that, described network node selects the IGMP business to E-Packet from the described multicast message that receives, judge that the customizing messages whether described IGMP business E-Packets with the packet network message is complementary, if, then convert described multicast message to unicast message, extract described clock information.
5, time clock distribution method according to claim 4 is characterized in that, MAC Address and IP information with the MAC Address and the IP information of described multicast message replaces to described unicast message extract the described clock information that is carried in the described unicast message.
6, a kind of apparatus for network node is characterized in that, comprising:
The message receiver module is used to receive the multicast message through the carrying clock information of main multicast source distribution;
The message modular converter is used for the described multicast message that described message receiver module receives is converted to unicast message;
The clock information extraction module is used for extracting described clock information from described unicast message.
7, apparatus for network node according to claim 6, whether it is characterized in that described apparatus for network node further comprises active and standby multicast source handover module, it is normal to be used to detect multicast service, if service disconnection switches to standby multicast source with described master with multicast source.
8, a kind of network system is characterized in that, comprises clock dispensing apparatus, a plurality of network node, wherein:
The clock dispensing apparatus, the multicast message that is used for will carrying with multicast mode clock information is provided to described a plurality of network nodes;
Described a plurality of network node is used to receive the multicast message of described carrying clock information and is converted to unicast message, extracts clock information from described unicast message.
9, network system according to claim 8 is characterized in that, described clock dispensing apparatus comprises main with multicast source and standby multicast source.
10, network system according to claim 9 is characterized in that, whether described a plurality of network nodes detect multicast service normal, if service disconnection is then led with multicast source or standby multicast source and switched.
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| CNA200710077477XA CN101453282A (en) | 2007-11-30 | 2007-11-30 | Time clock distribution method, equipment and system |
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| CNA200710077477XA CN101453282A (en) | 2007-11-30 | 2007-11-30 | Time clock distribution method, equipment and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013920A (en) * | 2010-12-03 | 2011-04-13 | 中兴通讯股份有限公司 | Clock backup method and system for time division duplex base station |
| CN102387475A (en) * | 2011-12-12 | 2012-03-21 | 深圳市共进电子股份有限公司 | Transmitting method for guaranteeing reliability of wireless multicast |
| CN103441938A (en) * | 2013-08-28 | 2013-12-11 | 南车株洲电力机车研究所有限公司 | Port switching method and communication equipment |
| CN110581828A (en) * | 2018-06-08 | 2019-12-17 | 成都鼎桥通信技术有限公司 | Time synchronization method and device for private network cluster terminal |
-
2007
- 2007-11-30 CN CNA200710077477XA patent/CN101453282A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013920A (en) * | 2010-12-03 | 2011-04-13 | 中兴通讯股份有限公司 | Clock backup method and system for time division duplex base station |
| WO2012071861A1 (en) * | 2010-12-03 | 2012-06-07 | 中兴通讯股份有限公司 | Method and system for time division duplex base station clock backup |
| CN102387475A (en) * | 2011-12-12 | 2012-03-21 | 深圳市共进电子股份有限公司 | Transmitting method for guaranteeing reliability of wireless multicast |
| CN103441938A (en) * | 2013-08-28 | 2013-12-11 | 南车株洲电力机车研究所有限公司 | Port switching method and communication equipment |
| CN110581828A (en) * | 2018-06-08 | 2019-12-17 | 成都鼎桥通信技术有限公司 | Time synchronization method and device for private network cluster terminal |
| CN110581828B (en) * | 2018-06-08 | 2022-05-03 | 成都鼎桥通信技术有限公司 | Time synchronization method and device for private network cluster terminal |
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Open date: 20090610 |